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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: DeleteAction.html 671 2015-01-17 15:50:55Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.core;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>/**<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Describes what action to take when an object that is still referred to by some other object is deleted.<a name="line.11"></a>
<span class="sourceLineNo">012</span> *<a name="line.12"></a>
<span class="sourceLineNo">013</span> * @see org.jsimpledb.core.Transaction#delete Transaction.delete()<a name="line.13"></a>
<span class="sourceLineNo">014</span> */<a name="line.14"></a>
<span class="sourceLineNo">015</span>public enum DeleteAction {<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>    /**<a name="line.17"></a>
<span class="sourceLineNo">018</span>     * Do nothing. The reference will still exist, but subsequent attempts to access the fields of the deleted object<a name="line.18"></a>
<span class="sourceLineNo">019</span>     * will result in {@link DeletedObjectException}.<a name="line.19"></a>
<span class="sourceLineNo">020</span>     */<a name="line.20"></a>
<span class="sourceLineNo">021</span>    NOTHING,<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>    /**<a name="line.23"></a>
<span class="sourceLineNo">024</span>     * Disallow deleting the object, instead throwing {@link ReferencedObjectException}. This is the default if not specified.<a name="line.24"></a>
<span class="sourceLineNo">025</span>     *<a name="line.25"></a>
<span class="sourceLineNo">026</span>     * &lt;p&gt;<a name="line.26"></a>
<span class="sourceLineNo">027</span>     * Note: deleting an object that is only referred to by itself will not cause any exception to be thrown.<a name="line.27"></a>
<span class="sourceLineNo">028</span>     * &lt;/p&gt;<a name="line.28"></a>
<span class="sourceLineNo">029</span>     */<a name="line.29"></a>
<span class="sourceLineNo">030</span>    EXCEPTION,<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>    /**<a name="line.32"></a>
<span class="sourceLineNo">033</span>     * Remove the reference, either by setting it to null (in the case of a {@link SimpleField} in an object),<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * or by removing the corresponding collection element or key/value pair (in the case of a {@link ComplexField} sub-field).<a name="line.34"></a>
<span class="sourceLineNo">035</span>     */<a name="line.35"></a>
<span class="sourceLineNo">036</span>    UNREFERENCE,<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    /**<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * Also delete the object containing the reference. This action will be repeated recursively, if necessary.<a name="line.39"></a>
<span class="sourceLineNo">040</span>     */<a name="line.40"></a>
<span class="sourceLineNo">041</span>    DELETE;<a name="line.41"></a>
<span class="sourceLineNo">042</span>}<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>




























































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